I am an experienced Ruby on Rails developer with over 6 years of expertise in the field. I have the following expertise:

1) Build new applications from development to deployment.

2) Maintain and troubleshoot existing web applications.

3) Revise, modularize, and update old code bases to modern development standards, reducing operating costs and improving functionality.

4) Have built teams and lead them for clients.

My core skills include:

1) Ruby on Rails Development: Proficient in building scalable web apps with Ruby on Rails, ensuring robust backend functionality and smooth user experiences.

2) Frontend Expertise: Skilled in JavaScript and HTML for crafting responsive and elegant user interfaces.

3) Database Mastery: Experienced with PostgreSQL and MySQL, designing efficient structures and optimizing query performance.

4) APIs Integration & 3rd Party Tools: Expert at integrating 3rd party APIs and tools (Google APIs, Twilio, SendGrid, BrainTree(Payment Integration), Sitelink, Elasticsearch, TinyMCE Editor, etc.), and enhancing app functionality.

5) Background Jobs: Proficient in Sidekiq, and DelayedJob for efficient background job processing.

6) Test-Driven Development (TDD): Utilizing RSpec and RuboCop for high code quality, extensive test coverage, and code optimization.

7) Server Deployment: Adept at deploying on DigitalOcean, AWS, and Heroku, configuring servers (Nginx, Apache), and automating with Capistrano.

8) Mobile API Development: Skilled in RESTful APIs, ensuring seamless integration with mobile apps.

9) Technical Leadership: Experienced leader, guiding teams, conducting code reviews, and maintaining coding standards.

10) Agile Development: Experience with agile methodologies, including scrum and sprint planning, resulting in efficient project execution and timely delivery.